Swifts are not so swift to update nesting

Hello world,
In the UK, 80% of Swift nests are found in homes from before 1920's. A lot of homes are being remodeled, and consequently, their homes are disappearing. Many surveys are being held to figure out exactly where their nests are. People in Britain are being taught how to make replacement nests as the old ones are destroyed. Hopefully, the people of england will be able to hear the call of the swift for many years to come. I think it is sad that these old houses are being remodeled, and that one of the few things stopping the renovators are bird nest instead of the owners.
Here's the link;
http://news.bbc.co.uk/2/hi/science/nature/8569267.stm